BootstrapBlazor.Extensions/src/components/BootstrapBlazor.Region/Components/SelectCity.razor.cs at 5a7e0584b6433bc7754e01b7bdfb5af630b5633b · BootstrapBlazor/BootstrapBlazor.Extensions · GitHub

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// Copyright (c) BootstrapBlazor & Argo Zhang (argo@live.ca). All rights reserved.
// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
// Website: https://www.blazor.zone or https://argozhang.github.io/

namespace BootstrapBlazor.Components;

/// <summary>
/// SelectCity 组件
/// </summary>
public partial class SelectCity
{
    /// <summary>
    /// 获得/设置 是否可多选 默认 false 单选
    /// </summary>
    [Parameter]
    public bool IsMultiple { get; set; }

    private string? ClassString => CssBuilder.Default("select bb-city")
        .AddClass("disabled", IsDisabled)
        .AddClassFromAttributes(AdditionalAttributes)
        .Build();

    private readonly HashSet<string> _values = [];

    private string? GetActiveClass(string item) => _values.Contains(item) || CurrentValue == item ? "active" : null;

    private async Task OnClearValue()
    {
        if (IsMultiple)
        {
            _values.Clear();
        }
        CurrentValue = "";

        if (OnClearAsync != null)
        {
            await OnClearAsync();
        }
    }

    private void OnSelectProvince(string province)
    {
        if (!IsMultiple)
        {
            return;
        }

        HashSet<string> cities = province switch
        {
            "直辖市" => Municipalities,
            "特别行政区" => SpecialAdministrativeRegions,
            _ => GetCities(province)
        };
        foreach (var city in cities.Where(city => !_values.Remove(city)))
        {
            _values.Add(city);
        }
        CurrentValue = string.Join(",", _values);
    }

    private void OnSelectCity(string item)
    {
        if (IsMultiple)
        {
            if (!_values.Remove(item))
            {
                _values.Add(item);
            }
            CurrentValue = string.Join(",", _values);
        }
        else
        {
            CurrentValue = item;
        }
    }

    private static HashSet<string> GetProvinces()
    {
        return
        [
            "直辖市",
            "河北省",
            "山西省",
            "辽宁省",
            "吉林省",
            "黑龙江省",
            "江苏省",
            "浙江省",
            "安徽省",
            "福建省",
            "江西省",
            "山东省",
            "河南省",
            "湖北省",
            "湖南省",
            "广东省",
            "海南省",
            "四川省",
            "贵州省",
            "云南省",
            "陕西省",
            "甘肃省",
            "青海省",
            "内蒙古自治区",
            "广西壮族自治区",
            "西藏自治区",
            "宁夏回族自治区",
            "新疆维吾尔自治区",
            "台湾省",
            "特别行政区"
        ];
    }

    private static readonly HashSet<string> Municipalities = ["北京市", "天津市", "上海市", "重庆市"];

    private static readonly HashSet<string> SpecialAdministrativeRegions = ["香港特别行政区", "澳门特别行政区"];

    private HashSet<string> GetCities(string provinceName)
    {
        if (provinceName == "直辖市")
        {
            return Municipalities;
        }

        if (provinceName == "特别行政区")
        {
            return SpecialAdministrativeRegions;
        }

        return RegionService.GetCities(provinceName);
    }
}